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震区地处盐源弧形构造(见附图)。该构造南起白灵,北到小金河;西至麦加坪,东达小高山,总体形态为一弧腼朝南的半园。南北(轴部)长55千米,东西(两翼)宽65千米,弧顶曲段为20千米,总面积2250平方千米。西翼以北西向的棉垭断裂(其分支为霍儿坪断裂)为主体,三叠系地层随之展布,新生代的沉积边界受其控制;东翼为北东向的断裂带,翼内是较
Earthquake area is located in salt arc structure (see photo). The structure starts from Bai Ling in the south to Xiaogu River in the north, and to the small mountain in Makag Ping and Tung Da in the west. The overall shape is a semi-circular park headed southwards. North-South (axis) 55 km long, east-west (two wings) 65 km wide, curved top section of 20 km, with a total area of 2250 square kilometers. The northwestern part of the west wing of the Miaya fault (whose branch is the Huo’erping fault) is dominated by the Triassic strata that is controlled by the Cenozoic sedimentary boundary. The east wing is the northeast fault zone and the wing Within is more